The proposed change for Precursors, to have them emerge years afterwards, sounds intriguing.
Would there be a possibility for Xenology or engineer units to discover dormant ground forces or ships, and be able to exploit them in some way ?
Certainly, on bigger ruins, I've found plenty of ship components, possibly enough of the right types to build complete warships. (i.e. fire controls, reactors, beam weapons, engines, jump engines, shield generators, sensors)